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Earnings Per Share (Tables) | 9 Months Ended
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Jun. 30, 2012
Earnings Per Share [Abstract] |
Computation of basic and diluted earnings (loss) per share |
|  | Three Months Ended June 30, |  |  | Nine Months Ended June 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Powell Industries, Inc. |  | $ | 12,138 |  |  | $ | 73 |  |  | $ | 17,804 |  |  | $ | 4,237 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average basic shares |  |  | 11,812 |  |  |  | 11,740 |  |  |  | 11,782 |  |  |  | 11,730 |
Dilutive effect of stock options and restricted stock units |  |  | 49 |  |  |  | 72 |  |  |  | 52 |  |  |  | 76 |
Weighted average diluted shares with assumed conversions |  |  | 11,861 |  |  |  | 11,812 |  |  |  | 11,834 |  |  |  | 11,806 |
Net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.03 |  |  | $ | 0.01 |  |  | $ | 1.51 |  |  | $ | 0.36 |
Diluted |  | $ | 1.02 |  |  | $ | 0.01 |  |  | $ | 1.50 |  |  | $ | 0.36 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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